alertness vs attention

alertness and attention both are nouns.

Word	Noun	Adjective	Verb	Adverb
alertness	Yes	No	No	No
attention	Yes	No	No	No

As nouns, attention is a hypernym of alertness; that is, attention is a word with a broader meaning than alertness:

alertness (noun)	attention (noun)
lively attentiveness	the work of providing treatment for or attending to someone or something
the process of paying close and continuous attention	a courteous act indicating affection
a state of readiness to respond	a motionless erect stance with arms at the sides and feet together; assumed by military personnel during drill or review
	the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others
	the faculty or power of mental concentration
	a general interest that leads people to want to know more